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Fault resistance is a source of error for distance relays leading to deviation of the measured impedance from its actual value. The presence of the fault resistance not only leads to measured resistance deviation, but also affects the measured reactance. This would lead to either under-reaching or over-reaching. This paper investigates the over-reaching aspect by defining over-reaching factor for...
A novel approach for detection and classification of power quality (PQ) disturbances is proposed. The distorted waveforms (PQ events) are generated based on the IEEE 1159 standard, captured with a sampling rate of 20 kHz and de-noised using discrete wavelet transform (DWT) to obtain signals with higher signal-to-noise ratio. The DWT is also used to decompose the signal of PQ events and to extract...
This paper presents the measured impedance at the relaying point in the presence of thyristor controlled series compensator (TCSC), one of the series connected flexible alternating current transmission system (FACTS) devices, in the case of inter phase, phase to phase and three phase, faults. The measured impedance at the relaying point itself depends on the power system structural and operational...
This paper discusses the measured impedance by distance relay in the presence of thyristor controlled series compensator (TCSC), one of the series connected flexible alternating current transmission system (FACTS) devices, on the next line, in the case of inter phase, phase to phase and three phase, faults. Especial attention is paid to the over-reaching problem. The measured impedance at the relaying...
This paper discusses the maximum ground fault resistance, which can be tolerated by a distance relay with Mho characteristic applied at the source node of a distribution feeder. This resistance is defined as the boundary fault resistance which is the boundary of the distance relay correct discrimination between in-zone and out-of-zone faults. The robustness criterion is defined based on the boundary...
This paper discusses the maximum ground fault resistance, which can be tolerated by a distance relay with Quadrilateral characteristic applied at the source node of a distribution feeder. This resistance is defined as the boundary fault resistance which is the boundary of the distance relay correct discrimination between in-zone and out-of-zone faults. The robustness criterion is defined based on...
Advancements in telecommunication technology have opened up new horizons in power system protection such as wide area protection. In this protection data collected at busbars of power system are transmitted to a control centre where a backup protection is provided to prevent blackouts. This paper proposes a technique for speeding up the protection while maintaining its integrity. Based on the fact...
This paper discusses the variation of distance relay robustness criterion as a function of Mho characteristic shifting angle as well as power system conditions. Boundary fault resistance is the maximum tolerable fault resistance which distance relay can discriminate between in-zone and out-of-zone faults. The robustness criterion is defined on the basis of the boundary fault resistance. In order to...
Fault resistance is a source of error for distance relays by the means of deviating the measured impedance from its actual value. The presence of the fault resistance not only leads to measured resistance deviation, but also the measured reactance deviates from its actual value. This would lead to both under-reaching and over-reaching. This paper investigates the over-reaching aspect by defining an...
This paper discusses the maximum fault resistance, which can be tolerated by a communication aided distance relay with Mho characteristic. This is defined as the boundary fault resistance, that for lower fault resistances the relay can discriminate between in-zone and out-of-zone faults correctly. The robustness criterion is defined on the basis of the boundary fault resistance. In order to achieve...
This paper presents the measured impedance at the relaying point in the presence of a series connected flexible alternating current transmission system (FACTS) device, i.e. static synchronous series compensator (SSSC). The presence of SSSC on a transmission line has a great influence on the tripping characteristic of distance relays. Distance relay tripping characteristic itself depends on the power...
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